No, they are completely different CFWs from different Persons.
While they are functionally similar, there are differences in that RajNX is easier configurable, has more telemetry prevention, but less updated and I think it doesn't include all sigpatches (but some) per default.

Also, RajNX is much closer to "normal" Atmosphere than ReiNX. It was basically founded because raj was not happy with how lightly the term "CFW" was given, so he basically went to make something to troll ReiNX (before that, Rei also trolled ReSwitched by having e.g. a discord server called ReiSwitched with a similar logo to ReSwitched, so it is always a chain of events ...).

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